(-)-(2R,4S)-2-[(3R,E)-5-(tert-butyldiphenylsiloxy)penten-3-yl]-2,4-dimethyl-3-methylene-4-carbomethoxycyclohexanone

(4R,4aR,6S,8aS)-8a-Methoxy-4a,6-dimethyl-5-methylene-4-vinyl-octahydro-chromene-6-carboxylic acid methyl ester

(-)-(3R,4S,8R)-methyl 8-[(1R)-1-[2-(acetyloxy)ethyl]-3-(3-furanyl)-3-oxopropyl]-4,8-dimethyl-7-oxo-1-oxaspiro[2.5]octane-4-carboxylate

methyl (3R,4S,8R)-8-((4R)-2-(furan-3-yl)-2-hydroxytetrahydro-2H-pyran-4-yl)-4,8-dimethyl-7-oxo-1-oxaspiro[2.5]octane-4-carboxylate

methyl (3aS,3a1S,5R,7aS,8S)-5-(furan-3-yl)-3a1,8-dimethyl-2-oxo-2,3,3a,3a1,4,5,8,9-octahydro-7H-5,7a-epoxyoxepino[5,4,3-de]chromene-8-carboxylate